| AHI | active hostility index; Animal Health Institute; apnea-plus-hypopnea index |
|---|---|
| aI | active ingredient |
| AI-CAH | autoimmune-type chronic active hepatitis |
| ALE | active life expectancy; allowable limits of error; amputated lower extremity |
| AP | accessory pathway; accounts payable; acid phosphatase; acinar parenchyma; action potential; active p... |
| T(L,CO) | the lung for carbon monoxide |
|---|---|
| TL,CO | the lungs for carbon monoxide |